(19)
(11) EP 0 345 594 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.01.1991 Bulletin 1991/03

(43) Date of publication A2:
13.12.1989 Bulletin 1989/50

(21) Application number: 89109682.8

(22) Date of filing: 29.05.1989
(51) International Patent Classification (IPC)4: C08L 21/00, C08K 3/34, C08K 5/32
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 07.06.1988 JP 141172/88
07.06.1988 JP 141173/88

(71) Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
Chuo-ku Osaka 541 (JP)

(72) Inventors:
  • Kurimoto, Isao
    Toyonaka-shi (JP)
  • Inui, Naoki
    Yamatokoriyama-shi (JP)
  • Yamaguchi, Tetsuo
    Hirakata-shi (JP)

(74) Representative: Henkel, Feiler, Hänzel & Partner 
Möhlstrasse 37
81675 München
81675 München (DE)


(56) References cited: : 
   
       


    (54) Method for improving properties of vulcanized rubber containing inorganic whity filler


    (57) Rubber filled with an inorganic whity filler such as white carbon is improved in its vulcanized rubber properties such as tensile strength, tear strength and heat build-up resistance by incorporating thereto a dinitrodiamine compound represented by the formula of

    wherein X is a divalent aliphatic, alicyclic or aromatic group which may contain halogen or oxygen in the group, R¹ is hydrogen, an aliphatic group, an alicyclic group or an aromatic group, with the proviso that two nitrogen atoms linking through X may further link through R¹ when both X and R¹ are the aliphatic groups, and R² and R³ independently of one another are each hydrogen or an alkyl of 1 to 12 carbon atoms, with the proviso that R² and R³ may conjointly form a ring. The dinitrodiamine compound acts as a coupling agent for the rubber and the inorganic whity filler.





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